Sawing-machine



'(No Model.) 3 Sheets- Sheet l. O. W. TROWBRIDGE.

SAWING MACHINE. No. 890,628. Patented Oct. 2, 1888.

'(No Model.)

3 Shets-Sheet 2. C. W. TROWBRIDGE.

SAWING MACHINE.

390.6Z8. Patented Oct. 2, 1 fl 2.

i J? (L (No Model.) I 3 Sheets-Sheet s.

G. W. TROWBRIDGE.

SAWING MACHINE.

No. 390,628. PatentedOot. 2, 18 88.

N. PETERS, PhoXn-Lflhcgnpher, Waihi nnnnnnn C.

UNTTED STATES PATENT OFFICE.

CHARLES \V. TROWBRIDGE, OF CHICAGO, ILLINOIS.

SAWiNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 390,628, dated October 2, 1888.

Application filed June 26, 1888. Serial No. 278,287. (No model.)

To aZZ whom, it may concern:

Be it known that I, CHARLES W. Taow- BRIDGE, residing at Chicago, in the county of Cook and State of Illinois, and a citizen of the United States, have invented a new and useful Improvement in Portable Metal-Sawing Machines, of which the following is a specification, reference being had to the accompanying drawings, in which-- Figure 1 is a front elevation. section at line 2 of Fig. 1. Fig. 3 is a section at line 3 of Fig. 1. Fig. 4- is a side elevation. Fig. 5 is a perspective. Fig. 6 is a perspective showing a modification.

In Figs. 1, 2, 3, and 4. the device is supposed to be attached to an I-beam turned over upon its side, the beam being small.

- In Fig. 5 the device is shown attached to a beam standing in a vertical position, the beam being larger than that shown in Fig. 4.

In Fig. 6 the device is shown attached to the under side of a rail.

My invention relates to portable metalsawing machines.

The-invention consists in providing a stationary frame adapted to be fastened to the material which is to be cut, on which stationary frame a secondary frame moves when the machine is in use, carrying a circular saw which does the cutting, and in providing antomatie feeding devices.

That which I claim as new will be pointed out in the claims.

In the drawings, A represents the main frame or plate provided with a fixed jaw, a.

B is a movable jaw connected with a screw, 0. There is a screwthread in the part b to receive the screw 0. A pin, d, projects from the jaw B, which pin passes through a slot in the frame A.

e is a nut on the pin d. This nut is located in a groove, 1'', in the plate or frame A.

D is a frame arranged to slide upon the frame A.

E is a saw mounted on a shaft, F.

G is a shaft provided with a screw-thread which engages with a worm-pinion, 9, upon a screw-threaded shaft, H, which is supported in suitable bearings, h.

i is a housing over the pinion 9.

Fig. 2 is a j is a beveled wheel on the inner end of the shaft G, which engages with another beveled gear-wheel, It, on the shaft I, which is supported in a suitable bearing.

2 is a pinion on the shaft I.

m is a gear-wheel on the shaft F, which carries the saw.

The bearings for the shafts F G I and the housings for the wheelsj k Z on are cast with the sliding frame D.

n is a covering-plate.

o in Fig. 1 is a pin which passes through a crank-arm, p, which is secured to a screw-shaft, H, the pin being designed to prevent the crank from rotating.

J is a lever which passes through the upper end of a socket, q, adapted to engage with the square end r of the shaft G.

When the power is available the machine can be run by means of flexible shafting connected to the shaft G at r.

The machine is adapted to be used in cutting I-beams, railroad-rails, channel-irons, angle-irons, Tirons, and other irons.

In Fig. 6 I have shown a modification, the device thereshown being adapted to be attached to the under side of a railroad-rail, and in this figure I have shown two operating-levers. Other modifications will readily occur to a mechanic skilled in the art which may be necessary to adapt the device to be secured to different forms of beams or rails.

I do not limit myself to the precise arrangement of operating devices which I have shown.

The operation is as follows: The device is to be secured to the metal upon which the saw is to operate by means of thejaws a and B, as indicated in Figs. 4 and 5. Then by means of the lever J the shaft G is to be rotated, and motion will thereby be given through the wheels j it Z m to the saw, and at the same time through the screw-thread on the shaft G and worm-pinion g the frame D will be moved, sliding upon the frame A, carrying the saw forward. When the cutting operation has been performed, the pin 0 is to be removed and the screw-shaft H can be rotated, bringing the frame D and the parts thereon back to the proper position to be again used.

The frame A not only supports the frame D,

but also serves the purpose of a guide for it.

That which I claim as new, and desire to secure by Letters Patent, is as follows:

1. In a portable metal sawing machine, a 5 main frame and guide, A, adapted to be secured to and supported by the material to be cut, in combination with a sliding frame, D, a shaft, F, supported in bearings upon the sliding frame D, and a circular saw, 0, mounted IO on said shaft F, substantially as and for the purpose specified.

2. A portable main frame and guide, A,

adapted to be secured to and supported by the material to be cut, and a sliding frame, D, and circular saw upon a shaft supported by the 15 frame D, in combination with automaticallyoperating devices for feeding the saw while cutting, consisting of a screw-threaded shaft, 0, Worm-gear g, and scrcw'tlireaded shaft H, substantially as and for the purpose specified. 20

CHARLES \V. TROVVBRIDGE. \Vitucsses:

ALBERT H. ADAMs, I'I'ARRY T. J onus. 

